Twig Variable Variables for a method

Question

I'm attempting to do something that was very easy in PHP, but not so easy in twig.

Basically, I need to call a class method, but I need to be able to define the method to call via a string.

I have 3 methods: getControlvs, getControlnc and getControltr. However, in order to call these methods, I need a seperate variable which determines which one to call.

This is what I'm attempting to call right now:

{% set neutPer = key.getControl~neutFaction %}

Where neutFaction can be either "vs", "nc", or "tr".

This only seems to fire key.getControl and then that's it, the concatenation is lost.

Any ideas?

Thanks in advance!

Answer 1

You can use the attribute twig function:

First concatenate the string as:

{% set method = "getControl" ~ neutFaction %}

Then call as

{{ attribute(key, method) }}

You can pass arguments also as:

{{ attribute(key, method, arguments) }}

In addition, the defined test can check for the existence of a dynamic attribute:

{{ attribute(object, method) is defined ? 'Method exists' : 'Method does not exist' }}